All the different theories of the will may be included under the three classes of Necessity, Contingency, and Certainty.
Necessity.
To the first of these classes belong: —
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The doctrine of Fatalism, which teaches that all events are determined by a blind necessity. This necessity does not arise from the will of an intelligent Being governing all his creatures and all their acts according to their nature, and for purposes of wisdom and goodness; but from a law of sequence to which God (or rather the gods) as well as men is subject. It precludes the idea of foresight or plan, or of the voluntary selection of an end, and the adoption of means for its accomplishment. Things are as they are, and must be as they are, and are to be, without any rational cause. This theory ignores any distinction between physical laws and free agency. The acts of men and the operations of nature are determined by a necessity of the same kind. Events are like a mighty stream borne onward by a resistless force, — a force outside of themselves, which cannot be controlled or modified. All we have to do is to acquiesce in being thus carried on. Whether we acquiesce or not makes no difference. A man falling from a precipice cannot by an act of will counteract the force of gravity; neither can he in any way control or modify the action of fate. His outward circumstances and inward acts are all equally determined by an inexorable law or influence residing out of himself. This at least is one form of fatalism. This view of the doctrine of necessity may rest on the assumption that the universe has the ground of its existence in itself, and is governed in all its operations by fixed laws, which determine the sequence of all events in the mineral, vegetable, and animal kingdom, by a like necessity. Or it may admit that the world owed its existence to an intelligent first cause, but assume that its author never designed to create free agents, but determined to set in operation certain causes which should work out given results.. However fatalists may differ as to the cause of the necessity which governs all events, they agree as to its nature. It may arise from the influence of the stars, as the ancient Chaldeans held; or from the operation of second causes, or from the original constitutions of things; or from the decree of God. It avowedly precludes all liberty of action, and reduces the acts of men to the same category with those of irrational animals. Properly speaking, however, fatalism refers this necessity to fate, an unintelligent cause.
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A second form of the doctrine of necessity, is the mechanical theory. This denies that man is the efficient cause of his own acts. It represents him as passive, or as endued with no higher form of activity than spontaneity. It avowedly precludes the idea of responsibility. It assumes that the inward state of man, and consequently his acts, are determined by his outward circumstances. This doctrine as connected with the materialism of Hobbes, Hartley, Priestley, Belsham, and especially as fully developed by the French Encyclopædists, supposes that from the constitution of our nature, some things give us pain, others pleasure: some excite desire, and others aversion; and that this susceptibility of being acted upon is all the activity which belongs to man, who is as purely a piece of living mechanism as the irrational animals. A certain external object produces a corresponding impression on the nerves, that is transmitted to the brain, and an answering impulse is sent back to the muscles; or the effect is spent on the brain itself in the form of thought or feeling thereby excited or evolved. The general features of this theory are the same so far as its advocates ignore any distinction between physical and moral necessity, and reject the doctrine of free agency and responsibility, however much they may differ on other points.
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A third form of necessity includes all those theories which supersede the efficiency of second causes, by referring all events to the immediate agency of the first cause. This of course is done by Pantheism in all its forms, whether it merely makes God the soul of the world, and refers all the operations of nature and all the actions of men to his immediate agency; or whether it regards the world itself as God; or whether it makes God the only substance of which nature and mind are the phenomena. According to all these views, God is the only agent; all activity is but different modes in which the activity of God manifests itself.
The theory of occasional causes leads to the same result. According to this doctrine, all efficiency is in God. Second causes are only the occasions on which that efficiency is exerted. Although this system allows a real existence to matter and mind, and admits that they are endowed with certain qualities and attributes, yet these are nothing more than susceptibilities, or receptivities for the manifestation of the divine efficiency. They furnish the occasions for the exercise of the all-pervading power of God. Matter and mind are alike passive: all the changes in the one, and all the appearance of activity in the other, are due to God’s immediate operation.